GI GI Anatomy and Physiology

Question 1

Which layer of the GI tract contains blood vessels, lymphatics, and the submucosal (Meissner's) plexus?

Accepted Answer

Submucosa

Answer

Mucosa

Answer

Muscularis externa

Answer

Serosa

Question 2

What is the primary function of the ileocecal valve?

Accepted Answer

Prevent backflow of colonic contents into the ileum

Answer

Absorb vitamin B12

Answer

Secrete digestive enzymes

Answer

Regulate gastric emptying

Question 3

Which cells in the gastric mucosa produce intrinsic factor?

Accepted Answer

Parietal cells

Answer

Chief cells

Answer

G cells

Answer

Mucous neck cells

Question 4

Brunner's glands, which secrete alkaline mucus to protect the duodenal mucosa, are located in which layer?

Accepted Answer

Submucosa

Answer

Mucosa

Answer

Muscularis externa

Answer

Serosa

Question 5

The migrating motor complex (MMC) phase III is characterized by which activity?

Accepted Answer

Intense, regular contractions sweeping the gut

Answer

Complete motor quiescence

Answer

Irregular contractions

Answer

Random, low-amplitude contractions

Question 6

Which segment of the colon has the highest rate of water and electrolyte absorption?

Accepted Answer

Ascending (right) colon

Answer

Sigmoid colon

Answer

Descending colon

Answer

Transverse colon